Oakland and the East Bay are served by the 510 area code, joined in 2019 by the 341 overlay. Together they cover Alameda County and part of western Contra Costa County. Because the two codes overlay the same area, 10-digit dialing is required for every local call.
Fast Facts: Oakland Area Codes
| City | Oakland, California |
| Primary Area Code(s) | 510 |
| Overlay Area Code(s) | 341 (2019) |
| Time Zone | Pacific Time (PT) – PST / PDT |
| Major Counties | Alameda (and western Contra Costa) |
| Dialing | 10-digit required |
Area Codes in Oakland – Detailed Breakdown
510 – Oakland & the East Bay
Split from 415 in 1991, the 510 area code covers Oakland and the inner East Bay, including Berkeley, Alameda, Fremont, Hayward, San Leandro, and Richmond.
341 – East Bay overlay
Introduced in 2019 as an overlay of 510, the 341 code covers the same Oakland and East Bay territory and appears mostly on recently activated numbers.
Neighborhoods & District Mapping
The 510 and 341 codes cover every Oakland neighborhood, including Downtown and Jack London Square, Lake Merritt, Rockridge, Temescal, the Fruitvale, West Oakland, and the Oakland Hills. The same codes serve the surrounding East Bay cities of Berkeley, Alameda, San Leandro, Hayward, and Fremont in Alameda County, plus Richmond and San Pablo in western Contra Costa County.
Oakland is the largest city in the East Bay and a major cultural and economic center of the San Francisco Bay Area, anchored by the Port of Oakland – one of the busiest container ports in the country – along with healthcare, biotechnology, and a diverse arts and food scene. The University of California, Berkeley sits just to the north. Rapid Bay Area growth led the original 510 code to add the 341 overlay in 2019, and every local call now requires 10 digits.
Local Dialing Rules & International Calls
Because 510 now shares an overlay with 341, 10-digit dialing is required for every local call in Oakland and the East Bay. To call a Oakland number from outside the United States, dial your country’s exit code, then +1 (the North American country code), then the 10-digit number (area code + seven-digit line number).
Major ZIP Codes in Oakland
Oakland ZIP codes run roughly 94601–94621, with neighboring East Bay cities such as Berkeley (94701–94720), Alameda (94501), and Fremont (94536–94539) covered by the same 510/341 region.
Spam & Scam Call Warnings in Oakland
Scammers often spoof local Oakland numbers to seem trustworthy. Watch for these tactics reported across the area:
| Scam Type | What to Watch For |
|---|---|
| Utility Shut-off | Fake PG&E reps threatening to cut power unless you pay immediately – a scam that repeatedly targets Bay Area small businesses. |
| Tech / Job Scam | Fake tech-company recruiter or remote-job offers seeking personal data or upfront fees. |
| IRS / Tax Scam | Callers threatening arrest over supposed unpaid taxes, demanding gift cards or wire transfers. |
| Bank Fraud Alert | Robocalls impersonating your bank about “suspicious activity” to phish account details. |
Red Flag: The IRS, Social Security Administration, and utilities like Pacific Gas and Electric (PG&E) will never demand immediate payment by gift card, wire transfer, or cryptocurrency. Hang up and verify using an official number.
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Nearby California Cities
Frequently Asked Questions
What area codes does Oakland use?
Oakland is served by the 510 area code and its 341 overlay, both covering the East Bay in Alameda County and part of western Contra Costa County.
Do I have to dial 10 digits in Oakland?
Yes. Because 510 shares an overlay with 341, you must dial the full 10-digit number for every local call.
Does 341 cover the same area as 510?
Yes. 341 is an overlay added in 2019 that covers the exact same Oakland and East Bay region as 510.
Is Oakland in the same area code as San Francisco?
No. Oakland and the East Bay use 510 and 341, while San Francisco uses 415 and 628, even though the two cities sit across the bay from each other.
Stay Safe & Explore More
- Verify an unknown caller in our Scam Alerts directory.
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